Results 31 to 40 of about 436 (184)

Caracterização elétrica de blocos varistores à base de SnO2 Electrical characteristics of SnO2-based varistor blocks

Cerâmica, 2012
Neste trabalho foi realizado um estudo das propriedades elétricas de blocos varistores à base de SnO2. Foram avaliadas a não linearidade destas cerâmicas por meio da caracterização tensão-corrente, bem como a altura, largura e os portadores de cargas por
R. L. Brito, P. A. P. Pessôa, J. S. Vasconcelos, L. P. S. dos Santos, J. H. G. Rangel, E. Longo, V. C. de Sousa, M. A. Ramirez, M. M. Oliveira   +8 more
doaj   +1 more source

Microstructure and Degree of Degradation of ZnO Varistors in Surge Arresters Due to Operation [PDF]

Archives of Metallurgy and Materials, 2018
The paper presents the test results for the microstructure of ZnO varistors comprising high voltage gapless surge arresters. The tests were performed on varistors produced in different periods and by various manufacturers.
P. Papliński, J. Wańkowicz, P. Ranachowski, Z. Ranachowski   +3 more
doaj   +1 more source

Analysis of MOA Damage Mechanism Under Multiple Strokes

Applied Sciences
Accident records from the actual operation of metal oxide arresters (MOAs) indicate that even MOA products that have passed standard tests still suffer from frequent damage.
Tao Yuan, Dengke Gao, Siyu Chen, Zhenjie Zheng   +3 more
doaj   +1 more source

Influência de dopantes doadores na degradação do varistor à base de SnO2 e o efeito do oxigênio pós-degradação nfluence of donor dopants on the degradation of SnO2 -based varistors and the effect of the oxygen post-degradation

Cerâmica, 2006
A degradação elétrica de varistores à base de SnO2 foi estudada e verificou-se que na temperatura de 220 ºC ocorreu a degradação do material. Suas características foram recuperadas quando tratadas em atmosfera de O2, o que mostra que esta atmosfera é ...
M. M. Oliveira, J. H. G. Rangel, V. C. de Sousa, E. R. Leite, E. Longo, P. R. Bueno, J. A. Varela   +6 more
doaj   +1 more source

Mechanism of Quasi‐Power‐Frequency Resonant Overvoltage Triggered by Multiple Lightning Strikes in High‐Voltage Alternating Current Systems Equipped With Shunt Reactor

High Voltage, EarlyView.
ABSTRACT This paper investigates the generation mechanism of quasi‐power‐frequency resonant overvoltage triggered by multiple lightning strikes in high‐voltage alternating current (HVAC) systems equipped with shunt reactors. Based on field measurements from a 500 kV AC system, equivalent and simplified circuit models have been established to analyse ...
Tao Liang, Tao Cui, Zhengxi Wang, Tongwei Guo, Xiaohui Wu, Hong Zeng, Jie Guo, Yanzhao Xie   +7 more
wiley   +1 more source

Aging Effects on PTCR Ceramics: SEM and C‐AFM Analysis of Electrical Conductivity and Domain Structures

International Journal of Applied Ceramic Technology, Volume 23, Issue 4, August 2026.
ABSTRACT This study examines the impact of aging on the electrical and structural properties of positive temperature coefficient of resistance (PTCR) ceramics. The presented study introduces a correlative scanning electron microscopy (SEM)/conductive atomic force microscopy (C‐AFM) approach enabling repeated, site‐specific characterization of ...
Kryštof Koller, Filip Ulč, Patrik Sokola, Veronika Hegrová, Petr Ptáček   +4 more
wiley   +1 more source

Electrical and microstructural properties of microwave sintered SnO2-based varistors Propriedades elétricas e microestruturais de varistores à base de SnO2 sinterizados por microondas

Cerâmica, 2012
An investigation was made of the microstructural and electrical properties of SnO2-based varistors microwave sintered at 1200 ºC, applying a heating rate of 120 ºC/min and treatment times of 10, 20, 30, 40, 50 and 60 min.
P. S. Furtado, M. M. Oliveira, J. S. Vasconcelos, J. H. G. Rangel, E. Longo, V. C de Sousa   +5 more
doaj   +1 more source

Performance and Mechanism Research on ZnO Varistor Ceramics Prepared by Microwave Sintering

International Journal of Ceramic Engineering &Science, Volume 8, Issue 4, July 2026.
Microwave sintering yields superior electrical performance of ZnO varistor ceramics versus conventional sintering, clarifies its grain boundary defect regulation mechanism, and provides a low‐energy, high‐efficiency preparation strategy. ABSTRACT To solve the problems of high sintering temperature, uneven grain growth, and limited electrical property ...
Zhiyao Fu, Haocheng Liu, Bowen Wang, Zhenglong Jiang   +3 more
wiley   +1 more source

Nature and Characteristics of a Voltage-Biased Varistor and its Embedded Transistor

IEEE Journal of the Electron Devices Society, 2015
An unorthodox approach for producing simple and yet practical transistors based on ceramic platforms is discussed in this paper. To achieve this, we modify the original nonlinear current-voltage (I-V) characteristics of a varistor by superimposing a ...
Raghvendra K. Pandey, William A. Stapleton, Ivan Sutanto   +2 more
doaj   +1 more source

Control of Varistor Voltage by Grain-size Control of Bi-added ZnO Varistors

IOP Conference Series: Materials Science and Engineering, 2011
Relationship between the grain size of ZnO and the amounts of Bi and Sb for Bi-Ba-Sb-Co-Mn-added ZnO was investigated. The amount of Bi at which the grain size of ZnO became the maximum shifted to the notably larger one by adding small amount of Sb such as 0.01 mol%.
Fukumori, Ai, Kubota, Atsuko, Sato, Yuuki, Yoshikado, Shinzo   +3 more
openaire   +1 more source